Element for a toy building set



FIG. 1 is a front perspective view of the element for a toy building set showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the element for a toy building set shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an element for a toy building set, as shown and described. 